Thanks for letting the community know George.
The same thing with the i7 NUC. Mine came with 1.63, but after the upgrade to 1.66 HD Audio bitstreaming was fine. The Intel download center page does not give you the download link for the HDMI firmware if you choose the NUC7i5 or NUC7i7 as your product - maybe this is something you can fix?
Ooh, yeah, will fix that right now!